Why?
@AmyChen The SanDisk SDDDC4 USB Dual Drive is not supported in the Memory Zone App for iOS. It can only be used with the Files app.
Have you checked our knowledge base articles?
( Get Support for Your SSDs and Flash Products | Sandisk )
Try these.
- Product Compatibility Matrix for SanDisk Memory Zone for iOS and Android | Sandisk
- Learn About SanDisk Memory Zone Mobile App Compatibility and What Drives Works With What Phone and How | Sandisk
Have you opened a Support Case?
If not, contact SanDisk Technical Support for assistance.
( Contact Support | Sandisk )
Oh my fun god. It’s ridiculous. Anyway, thank you for your response.
It seems incompatible with your phone.

